Lincoln Electric SVM101-B service manual Feeding Problems, Department

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F-5	TROUBLESHOOTING & REPAIR					F-5
TROUBLESHOOTING GUIDE					Observe Safety Guidelines
			detailed in the beginning of this manual.
PROBLEMS		POSSIBLE AREAS OF		RECOMMENDED
(SYMPTOMS)		MISADJUSTMENT(S)		COURSE OF ACTION
		FEEDING PROBLEMS
Major physical or electrical dam-		Contact Lincoln Electric Service
age is observed when cover wrap-		Department (1-888-935-3877)
around is removed.
Machine is dead — no output —		Power Switch must be in ON posi-		Check continuity of 3-amp slow
no fan — no display.		tion.		blow fuse located on reconnect
				panel.
		Check input voltage.		1. Check Power Switch (S1).
		If machine is set for single-phase		2. Look for loose or broken wires
		operation, inspect to assure that		between Power Switch and
		WHITE and BLACK leads of the			Input Rectifier (component
		Power Cord are connected properly			D13).
		and RED lead is not connected and		3. Check for broken leads to pri
		is insulated.
					mary of Auxiliary Transformer
		Check that input voltage set-up			T1.
		switch and jumper A (the reconnect,		4.	Possible open primary coil of
		auxiliary jumper) are in proper posi-
		tion for input voltage being used.			Auxiliary Transformer T1.
No output but fan operates and the		Output Terminal Switch or Remote		1.	See Output Pilot Circuit test.
meter display is on.		Trigger MUST be in ON position.		2. See Thermal Protection AC
		Local/Remote Switch must be in			Trigger Circuit test.
		LOCAL position unless remote con-		3.	See Overvoltage Protection
		trol device is attached to remote
		receptacle.			DC Trigger Circuit test.
		If machine has not been used for a		4.	See Capacitor Balance	test
		long time and is connected for	380	5.	See Switch PC Board test.
		VAC or higher, Capacitors may
		need “conditioning.” See Input		6.	See Power Board test
		Filter Capacitor Conditioning	in
		this section		7. Look for broken or loose con-
					nections on high current-carry-
					ing parts of machine (i.e.,
					choke, output bridges,	output
					studs, main transformer.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.

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